
body, html {
    height: 100%;
}

body {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    margin: 0;
    padding: 0;
    background-color: #446072;
    font-family: "Microsoft YaHei", sans-serif;
    color: white;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    overflow: hidden;
}

h1 {
    margin-top: 2rem;
}

p {
    font-family: "Microsoft YaHei", "Segoe UI", "Lucida Grande", Helvetica, Arial, sans-serif;
}

.shelf {
    position: relative;
    width: 30rem;
    height: 14rem;
    border: 0.5rem solid #374d5b;
    border-radius: 0.5rem;
    background-color: rgba(255, 255, 255, 0.1);
    -webkit-perspective: 130rem;
    perspective: 130rem;
    box-shadow: inset 0 0 2rem rgba(0, 0, 0, 0.2);
}

.door {
    position: absolute;
    width: 14.8rem;
    height: 14rem;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    box-sizing: border-box;
    padding: 1rem;
    background-color: #374d5b;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.3);
}

.door::before {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.1);
    content: "";
}

.door.left {
    border-radius: 0 0.75rem 0.75rem 0;
    -webkit-box-pack: end;
    -webkit-justify-content: flex-end;
    -ms-flex-pack: end;
    justify-content: flex-end;
    -webkit-animation: leftDoorOpen 3.5s ease-out forwards 1s,
    leftDoorFlap 15s linear infinite forwards 9s;
    animation: leftDoorOpen 3.5s ease-out forwards 1s,
    leftDoorFlap 15s linear infinite forwards 9s;
    -webkit-transform-origin: 0 0 0;
    transform-origin: 0 0 0;
}

.door.right {
    right: 0;
    border-radius: 0.75rem 0 0 0.75rem;
    -webkit-animation: rightDoorOpen 3s ease-out forwards 1.5s,
    rightDoorFlap 10s linear infinite forwards 8s;
    animation: rightDoorOpen 3s ease-out forwards 1.5s,
    rightDoorFlap 10s linear infinite forwards 8s;
    -webkit-transform-origin: 100% 0 0;
    transform-origin: 100% 0 0;
}

.book {
    position: absolute;
    box-sizing: border-box;
    padding: 0.8rem 4rem 0.8rem 2rem;
    border-radius: 0.25rem;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    cursor: pointer;
    box-shadow: inset 0 0 0.75rem rgba(255, 255, 255, 0.1);
}

.book.home-page {
    -webkit-transform: rotate(-90deg) translate(-12.4rem, 3rem);
    transform: rotate(-90deg) translate(-12.4rem, 3rem);
    -webkit-transform-origin: 0;
    transform-origin: 0;
}

.book.about-us {
    -webkit-transform: rotate(-100deg) translate(-13.4rem, 6.1rem);
    transform: rotate(-100deg) translate(-13.4rem, 6.1rem);
    -webkit-transform-origin: 0;
    transform-origin: 0;
}

.book.contact {
    right: 2rem;
    bottom: 0.2rem;
    border-radius: 0.3rem 0 0 0.3rem;
}

.book.faq {
    right: 0.8rem;
    bottom: 3.3rem;
    border-radius: 0.3rem 0 0 0.3rem;
}

.book.not-found {
    width: 12rem;
    height: 3.5rem;
    border: 1px dashed rgba(255, 255, 255, 0.3);
    background-color: transparent;
    -webkit-transform: rotate(-90deg) translate(-12rem, 13rem) scale(1);
    transform: rotate(-90deg) translate(-12rem, 13rem) scale(1);
    -webkit-transform-origin: 0;
    transform-origin: 0;
    cursor: default;
    -webkit-animation: bookFadeOut 1s 3s infinite forwards;
    animation: bookFadeOut 1s 3s infinite forwards;
}

.book.not-found::after {
    display: block;
    width: 10rem;
    padding-left: 5rem;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='30'><path fill='rgb(255, 255, 255)' d='M7.688,3.737C6.1,10.409,4.624,16.982,2.475,23.517c-0.424,1.29,0.724,2.338,1.957,1.916 c5.879-2.021,11.743-4.107,17.409-6.696c1.246-0.572,0.443-2.366-0.815-1.932c-3.856,1.333-7.695,2.69-11.565,3.959 c2.879-2.526,5.485-5.215,9.013-7.17c4.441-2.459,9.299-4.109,14.281-4.915c10.903-1.772,22.052,0.562,31.979,5.04 c9.241,4.162,12.895,8.725,13.164,4.942c0.121-1.69-5.57-4.953-14.125-8.714C53.19,5.292,41.094,3.539,29.636,6.058 c-7.122,1.567-16.708,5.374-22.064,11.544c1.359-4.455,2.461-9.028,3.032-13.563C10.852,2.091,8.12,1.927,7.688,3.737z'/></svg>");
    background-repeat: no-repeat;
    background-size: 4rem;
    background-position: left center;
    font-family: "Dancing Script";
    text-transform: lowercase;
    font-size: 25px;
    content: "this page can't be found";
    -webkit-transform: rotate(90deg) translate(6rem, -1rem);
    transform: rotate(90deg) translate(6rem, -1rem);
    opacity: 0.3;
}

.book:hover:not(.not-found) {
    background-color: rgba(255, 255, 255, 0.2);
}

@-webkit-keyframes leftDoorOpen {
    60% {
        -webkit-transform: rotateY(-115deg);
        transform: rotateY(-115deg)
    }
    100% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
}

@keyframes leftDoorOpen {
    60% {
        -webkit-transform: rotateY(-115deg);
        transform: rotateY(-115deg)
    }
    100% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
}

@-webkit-keyframes rightDoorOpen {
    60% {
        -webkit-transform: rotateY(125deg);
        transform: rotateY(125deg)
    }
    100% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
}

@keyframes rightDoorOpen {
    60% {
        -webkit-transform: rotateY(125deg);
        transform: rotateY(125deg)
    }
    100% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
}

@-webkit-keyframes rightDoorFlap {
    0% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
    5% {
        -webkit-transform: rotateY(125deg);
        transform: rotateY(125deg)
    }
    15% {
        -webkit-transform: rotateY(117deg);
        transform: rotateY(117deg)
    }
    25% {
        -webkit-transform: rotateY(123deg);
        transform: rotateY(123deg)
    }
    30% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
    100% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
}

@keyframes rightDoorFlap {
    0% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
    5% {
        -webkit-transform: rotateY(125deg);
        transform: rotateY(125deg)
    }
    15% {
        -webkit-transform: rotateY(117deg);
        transform: rotateY(117deg)
    }
    25% {
        -webkit-transform: rotateY(123deg);
        transform: rotateY(123deg)
    }
    30% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
    100% {
        -webkit-transform: rotateY(120deg);
        transform: rotateY(120deg)
    }
}

@-webkit-keyframes leftDoorFlap {
    0% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
    5% {
        -webkit-transform: rotateY(-115deg);
        transform: rotateY(-115deg)
    }
    15% {
        -webkit-transform: rotateY(-107deg);
        transform: rotateY(-107deg)
    }
    25% {
        -webkit-transform: rotateY(-113deg);
        transform: rotateY(-113deg)
    }
    30% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
    100% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
}

@keyframes leftDoorFlap {
    0% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
    5% {
        -webkit-transform: rotateY(-115deg);
        transform: rotateY(-115deg)
    }
    15% {
        -webkit-transform: rotateY(-107deg);
        transform: rotateY(-107deg)
    }
    25% {
        -webkit-transform: rotateY(-113deg);
        transform: rotateY(-113deg)
    }
    30% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
    100% {
        -webkit-transform: rotateY(-110deg);
        transform: rotateY(-110deg)
    }
}

@-webkit-keyframes bookFadeOut {
    50% {
        border: 1px dashed rgba(255, 255, 255, 0.1);
    }
}

@keyframes bookFadeOut {
    50% {
        border: 1px dashed rgba(255, 255, 255, 0.1);
    }
}